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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6164cbb49845b1b6cfc07df2770a033ab66ecf08f01668f28d0c37ca5d639d4' 
  AND token = 'jpi4gSb45EvhkBlMt5Kc6MS1eqkkA1kEAW54N4Audp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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