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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2818d839df75a6c19205c027a0ab66bee088801b034b7e42617edb304c021e98' 
  AND token = 'txXztf2dYi7+kuN4HCboTq7eeHI+7MKN5+mM6i92rpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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