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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c57c7894ce2500724b2551f348b9199f8f839c07c9f3ac634d44a02a585519' 
  AND token = 'mNMF39qLWxvaIaq2NiW+Fnjtt18Fm6bk/6R6YkjxA24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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