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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ac6b5b4a4dd4c0dec95557c5712b3fab2374c4fe301556f29fc8afd693afc0' 
  AND token = 'osFSk7/9Fx1ViceA9c9aYZUkM8jvUC+skOBcBI0WCwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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