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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda45ae9e95c4a5e86cb6b88d9921d1d2c6fc6b34afde7222323ea69d5a335a1' 
  AND token = '0IAu27pFtAs81guhSGZtfIWS3e2/z9mGB0JqIu3Z80w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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