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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c642783e42644fb49d5775c23b3a887a16cc3ec36f6aae91ba4d8fc29c1f6b9' 
  AND token = 'CRiE2lqr2GXcsk/VM+lLkef9aH1ESrn63QaTVrrBj/E=' 
  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"
    }
  }
}