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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87376697ea4220b6e3abc650e761ecf7ef59f4a0cb22a1173ab9dd1abc902e0f' 
  AND token = 'a8QTSapHph89sh8m4PwX+xl4VRoSyMoRaSRm1ZKPgrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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