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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f6a08bb2eca91d806b17e1c5c22e3a9bf4e7211eaff01b9dfdda2ad8a5dddc' 
  AND token = 'LugIE82MfQ6dRrXPUdTN3r4qUm05e8hMmrNX7PbMuBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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