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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd30de5abb9c42e781ed167f50992c7c18d0352e86391074453b97e23700e9a' 
  AND token = 'Vop581c/pATU4Fv0HQJG7ySWpz6+Lde74sKD5x++asQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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