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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e194fbae27d6e8e8d76e0007f9061c1284657520d14e94c0098bf3d0d5fe50a' 
  AND token = 'XhKXlBQ6quBJ3Yfh6Y8r809OfPW6ylUPaW2ExEX/1Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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