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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9e0a9f1262254a2143d6cb96e8e720972ef9d1d4ca95a56e7ae4f0c535ef1d' 
  AND token = 'PufCprLHXAHsn86zPABd6LaAys2eQZFb1+En8OMQKQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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