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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0273035651e30c48f883f28460c63512dc90a51174cd6d2f35feb9844f36398d' 
  AND token = '3qR2lpBBmmdzdOHnfKcHwlTUC1ad+x82j3kSq4XNWAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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