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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a7f1b486a905843947428fba7a45738cf9ec5d2ef24dc81af0af02b79021e3' 
  AND token = '+6AyCToKFzApGhnCTk17xYOZ5AcftMrEfJUD1B4wUzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}