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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63db7a0a68083920e8f04bb1b68df704b8967849d2afd0818911d0fad7548a1a' 
  AND token = 'vYvCawAoYdBzQvR2Xea7Xz3VFC7yqX7kdcP6p6qOBfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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