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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41e61f47b9a82971c5a85ede42ef47b6af312cb4551b0a695ac3aa6035ab4d9' 
  AND token = 'gE+grMjxyqvEmn8l89iOXI/ezgMyCGpHPkr/nbfXJPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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