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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f639d08ff36a50d972b78152169ac981664945d62eb531543b198138c6ee498a' 
  AND token = '5oz71LFtzEV8QJEyDbMN0qvyxEzv7evLwl93Gnd4quk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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