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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b067808654383d34b12b8e0184074e1c1b965459161ccb66c4122c77f1cdf8a' 
  AND token = 'ML7s9ovPNnR+zMaBJwMimzzuz5H0e5AdktDayjZFuJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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