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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5182e6e84a5bddce6a5df3c685a4ad8be500dccf339cdfa5ee7faffd68c25e5b' 
  AND token = 'MerMY4Y3W8BVc5bsdxBiao6uFzHXbz5Ttihy7mdpGjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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