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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd72815208750e649031797c81d7855c0ecaa0cae0dc65e7383e26583ef9b7c8' 
  AND token = 'a2VBou8qAM/Jxwfnu/+OX75H3bUtze2bw98/Yyo0bic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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