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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d85b61b0109c2a204e4961efc61f4b837e0b9cbf4cbfd0725a9487bd6fecba1' 
  AND token = 'zM6Qnth5u5XyVD5EYIum2VpIb6amJeq3qYiUHf25Xg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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