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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f186a07374d908b4d8e08b53fd74ea7ba7fee2a5c355e96efdc3e3454aaefd48' 
  AND token = 'dIy9/fIPIYN13uumF0lC81ukWEBV4fhQIJKxAkZQsTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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