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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6864b5c4cbdf9ba77ebdaa518f7ed7894cf2ba09ae8f7ec100e7f916f0c4a99' 
  AND token = 'bUGFXPKXRczPjoHhwKDhtKX93rU+bwtMjbB3s2XIuwA=' 
  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"
    }
  }
}