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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daaf6bdd8e53cbab5970d0ab37da86f29abb25e49cf3ddaa4ebdc8c06ddc9551' 
  AND token = 'TjAPj/p6OmcP3GwbE+Z/9AItbyVe3cQ/foufKH3xovY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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