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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1989975385cfbb2f68c95931ddd0ca7188a94ab35d798456dfcae762f193934' 
  AND token = 'ZtanCt8JiAihrcnh6X9MUWr9lhHqU0U2P5Ghxfmr4HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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