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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2041b1169afa14be689866cd831b5f6cdbc7d3349635533920fe698e387208' 
  AND token = 'oyfJzIHFb87/DNysfeQGFoK08r4ttlP8ndYuVDy6DG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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