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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd5736873e9df20b1bc01b6d231355e5e95077499dc36482f534f10d48f06f2' 
  AND token = 'J9/dN/xgTmBCUcmK4hEXDUc40OsksdxC+RRWNiI/8p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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