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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c4c028ca942359402d7b96e595db9a12690c75ba383697d5c07dd90725b1c8' 
  AND token = '1WJUwSasjslswApY4prWQnvRpjdvfBO1wABHqrB7geI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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