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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac29841ab8ab7f1c313fb8b58667aaddb9af8ad4843a71b039eab71dfa92ff83' 
  AND token = 'GMnXPhmxhv+V96PLlm6TxkAQUbRnC2hp8ED6ruSrr8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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