Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1ef984fd64928c1c6ce0d474a276339ffcfaef5472a2d5c3fb2bb05391ff90' 
  AND token = '6wME1VC/RHLlQEVqFeMY9l0Q/PBCR9Yb8t/01hB3Ycc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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