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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3b97c1dd165a3e2eca78d84383977d15e54b45664eecdeca2ab0fb1441d21e' 
  AND token = 'ZYIiBRyjA9k1LCP8yjNnu49W+QX9nh1xRI/rOJARlW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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