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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd699d2ecadb8c6de55e557b5f7462d94522830d5fb9db1f2239bc3227c4eb8' 
  AND token = 'NtQd369NE97Ayy35qZvVhvoEgJYyvne84+hz89TJLQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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