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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde6ebd1c690ae9cd295f14ade1328aa563f139acfe4e3df263de05a1b7f6360' 
  AND token = 'YaFV2eAUyUV7X/6vx7jMrkdNADKSxjvSg1yrFrvlALU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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