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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a54d443931b8364104b83157cdd6ad008e3dd47df5e9d6e1196004550a3a0a' 
  AND token = 'vp16rLBaaSViV+/yulI1zvlZzrzzqGgOLlRmmA+CtB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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