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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c042be68074ffe4d2ff787485c6d71ce2a39ae8b9689ff3ec3cf22f25543eb' 
  AND token = 'K3cBjDy6q+xjwTdZOuDFjHMP3wOKO8F1PKoi2khrMLc=' 
  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"
    }
  }
}