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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2396f2e0d0a4ad5efea40300ea4e560580d7dc0baa19f1ab44f703d06f34f394' 
  AND token = '7QgXpm4tJee70ssTMK9pHlgWMVKp+CZf3IWG796omqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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