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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ecfc68e220a05c118ced93eb51510463c9f91b79a13c8405b02329602c84d4' 
  AND token = 'Q6nTDgZgaHtsgvtVxVu0SUVOce2KUU3LHu9MOM3vY4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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