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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5adeac21213f3d76242c14670bab99c3c4feeb0884c5b59f397869f1a29024f' 
  AND token = '2M26KJcEkR7qgSrttHMCzWoiUFRXXfXdUJ1bzulXCHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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