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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0c7c19e77bc7713b35ec2ac5685f3c6e6e1d85c1666a4b732d1dc8eef6f50a' 
  AND token = 'Q+Y2bP+waacGJ0BkR/jsRCPOJTo5/mRa5pUV/g26WQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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