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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14619c7cb75c6bf57c6c8459c86dc1f231967b4373a8a1bab4c015137d6af794' 
  AND token = '05dkeQSQ9v7dO/d5kDSqC2SrLabx0WBJantrw7Q+pRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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