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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8faa9433cceabc5832e54a04f85f776a800ad5bc2feaa23a8c3538dd911e880' 
  AND token = '6J86D3OatAuh7LVmzt4AYZ9wY6b9P/DqmOhbI7J5yfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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