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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f8885a406ab9cf0aeb3f8f30cf234d3f910085cd9b416e74f4003561c05bdf' 
  AND token = '84koCGLx93EzNWjvpth/8VSvJ2CDd8YK5oJw3ip09GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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