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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f0d3d0dc1ba887e8bf6f49288a98fdb690c3699fac8103b1fe30a0eb35b8d8' 
  AND token = '33uvftosofaYfOhofQaTvCpx9Ol2fVethPO2J+vwyZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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