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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0454333e0d0305be039e9659f479aae1e1dd0c8c40aa3f20df5969435cd9c122' 
  AND token = '9UvPmkBJFJL1JZCjVRHcUPQxn45JN4ML1S5fzLWz6b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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