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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdea8616cc21f5938ab705b00ca1df0cc3fd15bfa6a767796d7d247a78b5d321' 
  AND token = 'CGdIk+AMpm0WEm1znufGXNalsT0m7c1axB6UongbCZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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