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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25dee67fa160bf2ff312e4a58232432d4deb1811f0841f92680f378d2d344bc7' 
  AND token = 'Y4i3hlEpL5A1FEPX8bAB/ko+d5vqMpLt7/icdPWX+K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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