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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2edb94c8acc6eb83ba2f13678f3bcee209586ad244b8f04a8469f953dc569f' 
  AND token = 'usCQ1E4YKoOIaq0ned+7heDrA1m2X5T808ZycBlIUJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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