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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113f2b685ee61ded7305708b89af714c6f4a6f3e18f6e0ea72b6a55ee584dbd9' 
  AND token = '3+lRKXAHS4Ma6Nzt5moE/up0Kr3BhQKpzgUwLaeG7do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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