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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd72231490c56d0c6d1a5623e64331a543a92f712aa1a40d3fb2253d90d54d5' 
  AND token = 'NoJp80alDjlllUB9O2SZPxbWtf6pqe28K+Mb4OLnG5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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