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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44a26acac265df243a7a5600d2d7189212bba4e3e717e6ba48c8b9b05bdb2a7' 
  AND token = 'KIzs5l3vJW9Jgr3N2+k3I0O2SuX5zPBjGTxeAeBldIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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