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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55891a13775c4a4f2da8478535601b9d88ec5ee49ea276f74ff33159e3817576' 
  AND token = 'o01d2WmbprQbdx2XKUkx6fypnd/hovBT0rRmTJ/Ec+w=' 
  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"
    }
  }
}