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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e0fb9854242778c0144806ff413d98fdcc8ebe4ff125ad3d0b4a59bc04e478' 
  AND token = 'k9OGGaNIfKADA2MVSHNrltX7GeFVNUzuyfK9vgGKatk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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